2.4.1.245 | purified enzyme free or as TreT-UDP binary complex, 10 mg/ml native enzyme from PEG 3350 25%, 0.2 M MgCl2, and 0.1 M sodium HEPES, 18°C, the selenomethionine-substituted protein crystal grow from 21% methoxy PEG 2000, 0.18 M ammonium sulfate, and 0.1 M sodium acetate, pH 4.6, for the UDP-glucose complex crystal, 5 mM UDPG is added to 10 mg/ml E326A protein for 1 h prior to setup of the crystallization using the same conditions as for the native crystal, X-ray diffraction structure determination and analysis at 2.3-3.0 A resolution, single-wavelength anomalous dispersion phasing |